Hydraulic shock absorber with regulating device



. Jun 20, 19 39. -R..BINDER El AL HYDRAULIC SHOCK ABSORBER WITH REGULAT-ING DEVICE 2 Sheets-Sheet 1 Filed May 13, 1937 Fig. 2.

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1/1/41 ll/ll/ I Jun 20, 1939.

HYDRAULIC SHOCK ABSORBER WITH REGULATING DEVICE Filed llay 13. 1937 2 Sheets-Sheet 2 Flg. 3.

Inventors Patented Julie 20, 1939 g UNITED STATES PATENT OFFICE" HYDRAULIC SHOCK ABSORBER WITH REGULATING DEVICE Richard Binder and Hermannklein, Schweinfurt, Germany Application May 13, 1937, Serial No. 1 42,398 In Germany May 16, 1936 8 Claims. (01. 188-88) The invention relates to a shock absorber of channels 20 devised in said piston so that the tubular shape adapted tobe inserted between working liquid can only be moved in the cylinspring-supported and supporting elements of ve-' der in one direction, viz. lifted in this example, hicles, such as-automobiles, while the shock aband a piston rod more or less projecting out of 5 sorber is of th usual construction in which a 'thecylinder, Further, a non-return foot valve 5 pump and the piston rod are directly connected I6 is mounted in the lower end of the cylinder. to the relatively movable parts. 1 The pump is concentrically surrounded by a More particularly the invention ielates to a Shell l2 which is attached to the pump cylinder regulating device for a hydraulic shock absorber through a head piece 29 and a foot piece 28 in 10 of the piston and cylinder type, comprising a any well known manner, such as screwing, soll0 casing, surrounding the cylinder and serving as dering, electrical brazing or like methods. The liquid container for the return fiow, and a spring space left between the tubes "land 12 constitutes loaded throttle valve at the head of the cylinder, the return conduit for the back flow of the workforming a passage from the cylinder to the liquid ing liquid and is. in open communication with M container. I I the interior of the pump through the foot valve 15 The object of this invention is to provide an J It. In the upp r end of the P p there is improved regulating device for a shock absorber posed a regulating valve I5 which is pressed on of this type whereby the apparatus may be reguits seat by'a powerful spring 22 the other end lated by hand fromfithe exterior without requir- Of w ich bears against the flanged inner end of 29 the dismantling of any part and while the a sleeve i5a shiftably guided in a central bore shock absorber is in its position of use onI-the i the head piec 9. a an 23 s d 0n the vehicle. head piece permitting to shift the sleeve 15a and As a feature of the present invention I prothus to {regulate the tension of the spring 22 for vide an" intericrly screw threaded cap which is varying the throttling effect of the valve it upon.

25 screwed on a threaded tubular extension arthe passage o the liquid from pp end of 5 ranged exterhally on the upper end of the said the pump to the conduit 25. Casing above the valve chamber on the head of When the shock absorber is applied to a vehicle the cylinder and which is adapted to be moved in the usual manner and entirely or almost enfrom the exterior of the said casing. This cap tirely filled with the Working q t 1.

acts upon the upper enci'of a sleeve, which passes the space 25 will at the same time act as a res- 30 out of the valve chamber through the said exervoir or compe t Chamber for the W in tension of the casing and which is freely movable liquid to be sucked into the lower pump space co-axially with respect to the piston rod. This with the upward piston stroke and as a receiver sleeve bears against the spring of the said valve, with the downw Strokey the (StrOkeS 5 and the threaded cap by its adjustment displaces either direction the working liquid is raised'and the sleeve and varies the stress in the spring. discharged through the valve 15, the throttling The annexed drawings, which form a part of efiect exercised therein on the said liquid causthis specification, illustrate three embodiments ing the damping of the Oscillations 0f the p of the shock absorber according to the invensupported part of the vehicle. The valve l5, be-" 40 tion. In the drawingsing of non-return construction; permits the flow 40 Fig. 1 is a longitudinal sectional view of a of liquid from the fcylinder ID to the liquid shockabsorber with regulating means easily acchamber 25 only in one direction, so that surgcessiblylocated ,at the upper end thereof; ing of the liquid back and forth in the com- Fig. 2-shows partly in section a modification pensating chamber and resultant foaming of 5 with a protecting mantle, the means for opersaid liquid is obviated. ating the regulating device projecting downward The shock absorber represented by Fig.2 'is out of the mantle; and substantially identically devised. For the pur- -.Fig. 3 is a further constructional embodiment pose of protecting the regulating means from in which the shell or housing of the shock abdamage and dirt, the fastening eye 33 of the pism sorber constitutes the regulating handle. ton rod is flanged and provided with a mantle Like numerals denote like or corresphnding 21 partly enveloping the upper end'of the shell sparts throughout all figures of the drawings. l2, and the head piece 29a. To obtain the de- Referring first to Fig. 1, the pump like shock sired accessibility, a large flange of the cap 23a absorber comprises. a cylinder l0,'a piston i8 is joined with a tubular extension 26 projecting. reciprocable therein, a non-return valve I! and downwards within the mantle 21 so as to serve as a handle when the tension 01' the spring 22 is to be varied by an angular movement of the cap 23a.

In a further modification'of the shock absorber according to Fig. lithe casing I2 fast on the head piece 291) is axially displaceable by means of screw threads 24 provided for on the foot piece and in the lower end of the casing so that by angular displacement of said casing the head piece 29!) supporting the spring 22 can be lifted or lowered while a screw threaded ring 3i serves as a counter nut. In. this construction, the member serves as a packing gland for.the piston rod i9 and does not serve as a spring adjusting member as in the case of member 23 in the construction of Fig. 1.

I claim:

1. A hydraulic double acting shock absorber including a pump cylinder, a piston reciprocable therein, a piston rod connected to said piston, a casing enclosing said cylinder and serving as a liquid container for the return flow, means for permitting passage of liquid from said cylinder to said container only in one direction and including a spring loaded non-return valve at the head of the cylinder axially disposed with respect to said cylinderand controlling the liquid 'flow between the interior of said cylinder and said liquid container, a threaded rotatable member co-axial with said cylinder and accessible for rotation from the outside of the shock absorber 40, liquid container for the return flow, a spring loaded valve controlling the liquid flow between the interior of saidcylinder and said liquid container and comprising a valve member encirclin said rod and seated on one end of said cylinder, a sleeve also encircling said rod, and a spring bea. rotatable memberencircling said rod, engaging said sleeve to hold the same against relative axial movement withrespect to said rod and accessible for rotation from the outside of said shock absorber, and means responsive to the rotation of said rotatable member for axially'moving said sleeve to selectively regulate the tension on said, spring.

A, shock absorber adapted to be fitted be- .,tween the axle and the frame of an automobile I vehicle and comprising a pump cylinder, a piston reciprocable therein, a piston rod connected to said piston, a casing surrounding said cylinder, and serving as a liquid container for the return flow, said casing having connected at its end a neck encircling said piston rod, a spring loaded valve at the head of said cylinder controlling the flow of liquid between said cylinder and said 65 liquid container and including a valve member encir'c'ling said rod and seated on one end of said cylinder, a sleeve encircling said rod and slidable therealong in said .neck, and a coil spring between said sleeve and said valve member and also 70 encirclingsaid rod, and a screw cap threaded onto said neck and engaging the upper end of tween said sleeve, and said valve member, and,

said sleeve wherebyupon rotation of said screw cap,-said sleeve is moved along said rod to regulate the tension of said spring.

4. A hydraulic double acting shock absorber including a pump cylinder, 9. piston reciprocable therein, a piston rod connected to said piston, a casing enclosing said cylinder and serving as a liquid container for the return flow, a spring loaded valve at the headof the cylinder axially disposed with respect to said cylinder and controlling the liquid fiow between the interior of said cylinder and said liquid container, a rotatable member having a skirt portion encircling said casing and forming a tubular handle by which said rotatable member may be rotated, and means responsive to the rotation of said rotatable member for regulating the spring on said valve. v

5. A hydraulic shock absorber as claimed in claim 3 characterized by the feature of a skirt 1 sleeve to form a tubular handle accessible from the outside of said absorber for rotating said screw cap. a

7. A hydraulic shock absorber including a pump cylinder, a piston reciprocable therein, a piston rod connected to said piston, a casing encircling said cylinder and serving as a liquid container for the return flow, said casing andsaid cylinder having a threaded engagement therebetween whereby upon rotation of said casiing, said casing will be moved axially with respect to said cylinder, a spring loaded valve at the. head of saidcylinder controlling the liquid. flow between said cylinder and said container,

and means responsive to the relaitve rotation of said casing and said cylinder for regulating the tension of the spring of said valve.

8. A shock absorber adapted to be iltted between the axle and the frame of an automobile vehicle and comprising a pump cylinder, a piston reciprocable therein, a piston-rod connected to said piston, a casing surrounding said cylinder, and serving as a liquid container for the return flow, said casing having a neck at one endencircling said piston rod, and a spring loaded valve at the head of said cylinder controlling the flow of liquid between said cylinder and said liquid container and including a valve member encircling said rod and se'ated'on one end of said cylinder, a sleeve encircling said rod, and slidable therealong, in said neck, and a coil spring between said sleeve and said valve member, and

' RICHARD BINDER.

HERMANN KLEIN. 

